# Kinetic Monte Carlo Simulations of the Effect of the Exchange Control Layer Thickness in CoPtCrB/CoPtCrSiO Granular Media

## TL;DR

This paper employs a hybrid kinetic Monte Carlo and Landau-Lifshitz-Gilbert simulation approach to analyze how the thickness of the exchange control layer influences the magnetic properties of dual-layer CoPtCrB/CoPtCrSiO granular media, comparing results with experimental data.

## Contribution

It introduces a hybrid kMC/LLG simulation method to study the effect of exchange control layer thickness on magnetic behavior in granular media.

## Key findings

- Demonstrates a quantitative relationship between layer thickness and exchange constant.
- Shows good agreement between simulation results and experimental data.
- Discusses challenges in calculating rate coefficients for low energy barriers.

## Abstract

A hybrid kMC/LLG algorithm is used to simulate experimental MH hysteresis loops for dual layer ECC media. The calculation of the rate coefficients and difficulties arising from low energy barriers, a fundamental problem of the kMC method, are discussed and the methodology used to treat them in the present work is described. The results from simulations are compared with experimental data on dual layer ECC CoPtCrB/CoPtCrSiO media. A quantitative relationship between the thickness of the exchange control layer and the effective exchange constant between the layers is demonstrated.